| Sunspot number | New regions | Background flux | C | M | X |
|---|---|---|---|---|---|
| 154 | 0 | C2.8 | 4 | 1 | 1 |
| Region | Start | Maximum | End | |
|---|---|---|---|---|
| - | C3.44 | 03:30 | 03:43 | 03:47 |
| - | C2.7 | 04:12 | 04:16 | 04:21 |
| 9733 | X2.8 Play | 07:58 | 08:08 | 08:14 |
| - | C4.6 | 10:06 | 10:19 | 10:29 |
| 9727 | M1.3 | 14:42 | 14:51 | 14:57 |
| - | C3.4 | 18:54 | 19:01 | 19:08 |
| Auroral activity | Minor | Severe |
|---|---|---|
| High latitude | 20% | 15% |
| Middle latitude | 1% | 1% |
| Predicted Kp max | 2 |
| Solar activity | |
|---|---|
| M-class solar flare | 1% |
| X-class solar flare | 1% |
| Moon phase |
|---|
| New Moon |
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| Last X-flare: | 2017/09/10 | X8.2 |
| Last M-flare: | 2017/09/09 | M1.1 |
| Last geomagnetic storm: | 2017/09/18 | Kp5 (G1) |
| Number of spotless days in 2017: | 56 | |
| Last spotless day: | 2017/08/01 | |
